Quote:
"Local variations in temperature may occur, caused, perhaps by inhomogeniety in radioactive elements."

There is absolutely no evidence for this.


There is considerable evidence for mantle inhomogeniety, both in chemistry and temperature. Eg. in L. Wen, et al: Seismic evidence for a thermo-chemical boundary layer at the base of the Earth's mantle, Earth Planet. Sci. Lett. 189 (2001) 141^143.

Does your theory provide a better explanation for temperature variations than associated variations in heat producing elements?

Obviously, I do not rule out endothermic and exothermic phase changes here, but in order for these to produce thermal anomalies there would have to be some vertical movement of mantle material, which you might be unhappy about.

There never was nothing.